//
//  Animal.h
//  08_Work
//
//  Created by dllo on 16/7/13.
//  Copyright © 2016年 yh. All rights reserved.
//

#import <Foundation/Foundation.h>

@interface Animal<__contravariant ObjectType> : NSObject

- (void)add:(ObjectType)object;

- (__kindof NSString *)returnStr;

@end
